Code Challenge - Backend Engineer Agaesh#212

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agaesh wants to merge 26 commits into99techteam:mainfrom

agaesh:feat/problem1-summations-agaesh-backend-engineer

Commits on Feb 11, 2026

feat(problem1): complete summation solutions and integrate endpoint

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fix: update problem1 to problem4 as requested

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Commits on Feb 12, 2026

Updated Package Json With necessary dependency like better-sqlite3 for database, express-router for handling user routing and nodemon in dev dependency to start the program in cmb USING npm run dev

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commiting database file

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commiting database file

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feat(problem5): complete user CRUD implementation

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Updated Readme.md for problem 5 and to instruct how to start server

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Test case written to make sure create, Read and Update work fine

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added condition to add score in existing table Users

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- Installed and Used Websocket for live Update

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Problem6: partial implementation of live leaderboard

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Updated Readme.md for problem6

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Refactored document to have some gaps between content

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Fix: queried only top 10 in desc to update leaderboard instead of all users

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Update flow of execution diagram in the readme.md

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Updated format of Visual Diagram

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problem6: Implemented security feature - JWT Token authorization for quiz submission

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created command for generating ,env and jwt secret key placeholder

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- added helmet to prevent ClickJack, XSS and browser based attactk. it act as new layer of security

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problem4: security feature - add rate limiting

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commited gitignore

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Commits on Feb 13, 2026

update README with instructions for using submit quiz Problem6 endpoints in router.

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feat(problem6): implement audit logging mechanism

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feat(problem6): add input sanitization with Joi

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Completed Assessment

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updated diagram format

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